TWI597950B - Method for relaying signal and relay using the same - Google Patents

Description

Method for relaying signals and repeater using the same

The present disclosure relates to a method of relaying signals and a repeater using the same.

Duplex communication systems are widely used in the telecommunications field, especially in the areas of telephone and computer network connections. Existing duplex wireless communication systems include a half-duplex type and a full-duplex type.

The half-duplex wireless communication system supports communication in both directions, but only supports communication in one direction at a time. Therefore, the repeater must first receive the data and transmit it at the next point in time after receiving the data. This makes the half-duplex wireless communication system inefficient and difficult to implement widely in wireless network systems because it takes almost twice as many time slots to complete the transmission of the half-duplex wireless communication system.

A full-duplex wireless communication system can simultaneously transmit and receive signals carrying data. Such systems enable the repeater to simultaneously receive signals while the transmission is in progress. However, the current wireless communication system is still a half-duplex Time Division Duplex (TDD) or Frequency Division Duplex (FDD), because there is no hardware available for full-duplex wireless communication systems in the past. solution.

Although some research groups have begun to propose some feasible solutions for current wireless communication systems or future wireless communication systems and design actual full-duplex radios, the technical problem to be solved is how full-duplex radios can assist source nodes to transmit data to destinations. And at the same time increase the maximum achievable rate. In other words, how to develop a full-duplex radio in a wireless communication system is one of the most concerned issues for those skilled in the art.

In view of this, the present disclosure provides a method of relaying a signal and a repeater using the same, by which the repeater can perform two different transmission topologies, including a diversity mode and multiplexing. )mode. Both of these transfer modes increase network throughput from source node to destination and provide better system performance.

The disclosed embodiments provide a method for relaying signals, which is applicable to a repeater. The method includes a plurality of steps of: receiving a signal having a power configuration from a source node; demodulating the signal having a power configuration to extract a symbol; re-adjusting the symbol to a symbol that is remodulated; and The delay passes the remodulated symbol to the destination.

The disclosed embodiments provide a repeater. The repeater includes a transceiver circuit, a storage circuit, and a processing circuit. The transceiver circuitry is configured to transmit and receive wireless signals. The storage circuit stores a plurality of codes. A processing circuit operatively coupled to the transceiver circuit and the storage circuit and configured to access the code to perform an operation of receiving a signal having a power configuration through a transceiver circuit; The signal is demodulated to extract a symbol; the symbol is again modulated into a remodulated symbol; and the remodulated symbol is transmitted through the transceiver circuit in accordance with a particular delay.

The above described features and advantages of the present invention will be more apparent from the following description.

1 is a schematic diagram of a relay system 100 in accordance with an embodiment of the present disclosure. The relay system 100 is a full-duplex wireless communication system and is capable of transmitting and receiving data simultaneously. The relay system 100 includes a source node 110, a relay node 120, and a destination node 130, but the possible embodiments of the present disclosure are not limited thereto.

Source node 110, relay node 120, and destination node 130 may be presented as various implementations, which may, but are not limited to, include, for example, a mobile station, an advanced mobile station (AMS), a server, a user terminal , laptop, network computer, workstation, personal digital assistant (PDA), telephone device, pager, camera, television, handheld video game device, wireless sensor, eNB, home eNB (home eNB, HeNB ), advanced base station (ABS), base transceiver system (BTS), access point, home base station, diffuser, repeater, intermediate node, intermediate communication base station, and/or satellite-based communication Base station, etc.

In this embodiment, source node 110 can transmit signals to relay node 120 and destination node 130. Relay node 120 can receive signals from source node 110, demodulate the signals to extract symbols, and modulate the symbols again. Relay node 120 may also transmit the remodulated symbols to destination node 130 upon receiving a signal from source node 110. Destination node 130 may receive signals from source node 110 and relay node 120 and decode the received signals to extract data symbols. It should be noted that when source node 110 transmits material to destination node 130, relay node 120 is the means by which secondary source node 110 transmits material to destination node 130.

Further, as shown in FIG. 2, the relay node 120 can be represented at least as a functional element. 2 is a block diagram of a relay node 120 in accordance with an embodiment of the present disclosure. Relay node 120 can include, at least but not limited to, transceiver circuitry 210, storage circuitry 220, and processing circuitry 230. Transceiver circuit 210 acts as a general purpose network interface card and is configured to communicate with and receive data from source node 110 and destination node 130 in FIG. The storage circuit 220 is, for example, a memory, a hard disk, or other device for storing data, and is configured to store a plurality of code or modules.

Processing circuit 230 is operatively coupled to transceiver circuit 210 and storage circuit 220. The processing circuit 230 can be, for example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor, a plurality of microprocessors, a combination of one or more microprocessors and digital signal processor chips, a controller, a micro control , dedicated integrated circuit (ASIC), field programmable gate array (FPGA), any other type of integrated circuit, state machine, based on advanced RISC machine (advanced RISC machine, ARM The processor and similar devices do not limit the disclosure. Processing circuitry 230 is configured to access code stored in storage circuitry 220.

There are two different transport topologies for the relay system 100 in this disclosure. The method is defined as a diversity mode and a multiplex mode for the relay system 100 based on different transmission topologies. Accordingly, processing circuitry 230 in relay node 120 is configured to access the code to perform the operations of the diversity mode and the multiplex mode, respectively. In the following sections, these modes will be described using specific examples in accordance with the disclosure to provide a detailed description.

First, FIG. 3 is a basic block diagram of a relay system 300 in a diversity mode according to an embodiment of the present disclosure. Referring to FIG. 3, the relay system 300 includes a source node 310, a relay node 320, a destination node 330, and channels 340, 341, and 342. The functions of the source node 310, the relay node 320, and the destination node 330 shown in FIG. 3 are the same as those of the source node 110, the relay node 120, and the destination node 130 shown in FIG. 1, and will not be described again. It should be noted that the relay system 300 is not limited to certain channel scenarios or network connection systems. In other words, it can be used in any channel scenario or network connection system. In one embodiment, a single-carrier single tap channel is applied in the diversity mode of channels 340, 341, and 342.

4 is a flow chart of a method for relaying a relay signal of a relay node according to an embodiment of the disclosure. Referring to FIGS. 2, 3 and 4, the method for relaying signals of the relay node 320 of the present embodiment is applied to the relay system 300 shown in FIG. 3, and will be described below with reference to each of FIG. Component Description Each step of the method for relaying a relay signal of relay node 320 is disclosed.

In step S410, the processing circuit 230 of the relay node 320 receives the signal having the power configuration through the transceiver circuit 210. In the present embodiment, the processing circuit 230 of the relay node 320 will receive a signal having a power configuration from the source node 310 through the transceiver circuit 210. The signal transmitted by the source node 310 includes a combined signal of a current symbol and a past symbol respectively having a power configuration.

In detail, the parameters are first defined: τ represents one symbol interval and k represents the kth symbol interval, wherein the symbol interval τ is based on different wireless network symbol interval specifications and is not limited thereto. Since source node 310 is in time Start transmitting symbols, so the first symbol interval can be expressed as , the second symbol interval can be expressed as And so on. Because the relay node 320 will transmit the signal after receiving the signal from the source node 310, it will delay the specified time to transmit the adjusted signal. Therefore, the data transmitted by the source node 310 of the diversity mode is defined as the following pattern: Equation (1)

In equation (1), Express Symbol interval and any positive integer, Express Signals in the symbol interval, Express Symbols, Represents the power configuration factor and is any real number between 0 and 1, Represents a delay factor and is any positive integer greater than 1, and Represents the total number of symbols and can be any positive integer. It should be noted that in the present disclosure, the delay factor Can be set dynamically, and the power configuration factor Factors that may affect system performance depending on the design of relay node 310 and destination node 330. In addition, The symbols may be modulated according to different types of modulation schemes, such as binary phase shift keying (BPSK), but the disclosure is not limited thereto.

In step S420, the processing circuit 230 of the relay node 320 demodulates the signal to extract the symbol. In step S430, the processing circuit 230 of the relay node 320 modulates the symbol again into a symbol that is modulated again. In the present embodiment, relay node 320 receives the signal from source node 310 and then demodulates the signal with the same modulation type as source node 310 to obtain one or more symbols. Relay node 320 will modulate the one or more symbols again. It should be noted that the relay node 320 of the diversity mode will modulate the symbols again using the same modulation type as the source node 310. For example, if source node 310 uses QPSK modulation, relay node 320 also uses QPSK modulation, but the disclosure is not limited to any modulation type.

In one embodiment, the processing circuitry 230 of the relay node 320 can further access the code to multiply the twiddle factor. (It can be a complex value) Perform a rotation on the symbol that is remodulated. Twirl factor Mainly aligning the repeater signal with the direction of the source signal on the destination side, and it will not modify the amplitude of the signal, ie, the absolute value of the length of the twiddle factor is one, ie, . In this way, the signal from source node 310 and the signal from relay node 320 can be directly added. Otherwise, if the twiddle factor is not applied, the signal from source node 310 and the signal from relay node 320 may have a 180 degree offset, which may cause destructive interference and reduce the received signal at destination node 330. Signal strength.

In step S440, the processing circuit 230 of the relay node 320 transmits the re-modulated symbol through the transceiver circuit 210 according to a specific delay. In this embodiment, the specific delay is a specified time until the start of a certain symbol interval, which can pass the delay factor To indicate, for example, the relay node 320 can delay the specified time to the first The symbol interval begins. In other words, the relay node 320 modulates one or more symbols again, and based on the delay factor The symbol interval is transmitted to the destination node 330 in the future. For example, the relay node 320 is in the Symbol interval receives signal Demodulating and extracting the data symbols . Relay node 320 then passes the data symbol Change to the same symbol again, and in the first Symbol interval (ie, ) Transfer the symbol that has been modulated again. It is worth mentioning that the re-modulation and delay process enables the relay node 320 to remove the noise signal when receiving the signal from the source node 310. Therefore, this prevents the repeater from forwarding the improper noise signal to the destination node 330, thereby improving the signal reception quality of the destination node 330.

Finally, destination node 330 can receive the mixed signal from source node 310 and relay node 320 and demodulate the received signal by using maximum likelihood (ML) decoding. For example, assume single-carrier single-order channel and diversity mode transmission, where the delay factor Is 2, and the total number of symbols transmitted from the source node 310 Is 3 (ie, ). The signal received by the destination node 330 can then be expressed as: Equation (2), where and .

In equation (2), Indicates the number received Signal, Indicates the number transmitted Symbols, Is the channel between the source node 310 and the destination node 330, Is a channel between the relay node 320 and the destination node 330, Is at The received noise is assumed to be a Gaussian random variable with an average value of 0 and a variance of 1 (but is not limited thereto), and Is the rotation factor. In this embodiment, the twiddle factor can be set to This allows the signal from the source node 310 and the signal from the relay node 320 to have the same angle. Therefore, the signal from the source node 310 and the signal from the relay node 320 can be directly added. But the twiddle factor is not necessarily Because the system can operate in any value of the twiddle factor.

Destination node 330 will be based on the received signal (transmitted by source node 310 and relay node 320) looking for the most approximate symbol . The destination node 330 can obtain the most approximate solution by the most approximate method (for example, a Viterbi algorithm), but the disclosure is not limited thereto.

In this embodiment, it is assumed that each state represents a solution of one symbol, that is, state 1 represents a symbol Solution, state 2 represents symbol Solution, and state 3 represents the symbol Solution. Each state will record the minimum distance between the received signal and the given state representing the symbol, which can be expressed by the following formula: Equation (3)

In equation (3), since the source node 310 and the relay node 320 modulate the symbols by QPSK modulation, the symbols are represented. with The given state can be expressed as 00, 01, 10 or 11, respectively. The minimum distance can be estimated in each state in turn. Until the last state. The final state will be recorded Minimum distance . So you can find The most likely solution.

Briefly, in the method of relaying signals in the diversity mode, the repeater receives the combined signal, and the combined signal includes a current symbol and a past symbol respectively having a power configuration. The repeater may demodulate the combined signal received from the source node, modulate the demodulated symbol again using the same modulation type as the source node, and transmit the remodulated symbol to the destination. Therefore, the re-modulation and delay process enables the repeater to remove the noise signal when receiving the signal from the source node and prevent the repeater from forwarding the improper noise signal to the destination. In addition, the destination can decode the data using ML decoding using signals from the source node and signals from the repeater. Therefore, through the signal relay mechanism of the diversity mode, the proposed method not only improves the reception quality of the destination, but also improves the system throughput of the relay to the destination link and the source node to the destination link.

In other embodiments, different types of channels and OFDM systems may also be used, although the disclosure is not limited thereto. For example, assume that there are two subcarriers in an OFDM system. Therefore, the symbols will be divided into two groups. However, the signal received at each subcarrier can independently find the most approximate solution using the same decoding method as mentioned above. In addition, diversity mode transmission can also be used in a single-carrier multi-tap channel, and the received signal can be decoded in a manner similar to that mentioned above to find the most approximate solution.

Next, FIG. 5 is a basic block diagram of a relay system 500 in a multiplex mode according to an embodiment of the present disclosure. Referring to FIG. 5, the relay system 500 includes a source node 510, a relay node 520, two destination nodes 530, 531, and channels 540, 541, 542, 543, and 544. The functions of the source node 510, the relay node 520, and the destination nodes 530, 531 shown in FIG. 5 are the same as the source node 110 and the relay node 120 and the destination node 130 shown in FIG. 1, and will no longer be here. Narration. The main difference between FIG. 5 and FIG. 1 is that there are two destination nodes 530 and 531 in the relay system 500. Moreover, the relay system 500 is also not limited to a certain channel scenario or network connection system. In one embodiment, single carrier single order channels 540-544 are applied for transmission in multiplex mode.

FIG. 6 is a flowchart of a method for relaying a relay signal of a relay node according to an embodiment of the disclosure. Referring to FIG. 2, FIG. 5 and FIG. 6, the method for relaying signals of the relay node 520 in this embodiment is applied to the relay system 500 shown in FIG. 5, and will be described below with reference to each of FIG. Component Description Each step of the method for relaying a relay signal of relay node 520 is disclosed.

In step S610, the processing circuit 230 of the relay node 520 receives the signal having the power configuration through the transceiver circuit 210. In the present embodiment, the processing circuit 230 of the relay node 520 will receive a signal having a power configuration from the source node 510 through the transceiver circuit 210. It should be noted that the power configuration includes a power configuration factor that has a value of one in the multiplex mode. In addition, the signal transmitted by the source node 510 includes only the current symbol, which is different from the diversity mode.

Therefore, the data transmitted by the source node 510 can be expressed as ,among them Is the kth modified symbol. It is assumed that the plurality of materials transmitted by the source node 510 contain L symbols, where L can be any positive integer. In addition, the L symbol may be modulated according to different types of modulation schemes, such as quadrature phase shift keying (QPSK), but the disclosure is not limited thereto. The source node 510 will simultaneously transmit data to the relay node 520 and the two destination nodes 530-531. .

In step S620, the processing circuit 230 of the relay node 520 demodulates the signal to extract the symbol. In step S630, the processing circuit 230 of the relay node 520 modulates the symbol again into a symbol that is modulated again.

In the present embodiment, relay node 520 receives the signal from source node 510 and then demodulates the signal using the same modulation type as source node 510 to obtain the demodulated symbol. Relay node 520 will then modulate the demodulated symbols again. It should be noted, however, that the multiplexer mode relay node 520 will modulate the demodulated symbols again with a modulation type lower than the source node 510. For example, if source node 510 uses QPSK modulation, relay node 520 can use the BPSK modulation to modulate the demodulated symbols because one QPSK symbol can be divided into two BPSK symbols, but the disclosure is not limited Any modulation type.

Therefore, the relay node 520 can demodulate the signal to obtain a demodulated symbol. . Relay node 520 will then demodulate the symbol Once again converted to a symbol that is re-modulated ,among them Is the mth symbol that has been mutated again. It should be noted that here is the demodulated symbol To extend the symbol that is mutated again Where M is the total number of symbols that are modulated again, which is a positive integer greater than L , and is based on the modulation type of source node 510 and relay node 520.

In step S640, the processing circuit 230 of the relay node 520 transmits the re-modulated symbol to one destination and another destination through the transceiver circuit 210 according to a specific delay.

In this embodiment, it should be noted that there are two destination nodes 530, 531 in the relay system 500. Thus, relay node 520 will transmit the re-modulated symbols to destination nodes 530 and 531. Due to the demodulated symbol of the relay node 520 The modulation is performed again, so the relay node 520 transmits the re-modulated symbol to the destination nodes 530 and 531 after a certain delay. . The specific delay is the specified time until the start of a certain symbol interval, which can pass the delay factor Representing, for example, relay node 520 can delay the specified time until the first The symbol interval begins. It should be noted that in the present disclosure, the delay factor It can be any positive integer greater than 1 and can be set dynamically.

In the present embodiment, τ is defined to represent a symbol interval, wherein the parameter τ can be based on symbol interval specifications of different wireless networks. Source node 510 at time Start the transfer. Since the relay node 520 will use a lower order modulation type for the demodulated symbol Make the modulation again, so the source node 510 will be in time carry out Transfer, while relay node 520 will be in time carry out Transfer. In this way, the source node 510 will be versus The time between idle. Therefore, the source node 510 will be versus Transfer between The second information symbol.

In one embodiment, the delay factor of relay node 520 is assumed. Is 3, and the total number of symbols transmitted from source node 510 Is 4 (ie, ). Source node 510 uses QPSK modulation and relay node 520 uses BPSK modulation. Since the data symbol transmitted by the source node 510 is , so the relay node 520 uses BPSK to tune the received symbol again. . Thus, there are six idle symbol intervals before the relay node 520 completes the transfer. Thus, the source node 510 can transmit the second data symbol in the six symbol intervals. .

In this embodiment, since there are two destination nodes 530, 531 receiving mixed signals from the source node 510 and the relay node 520, at the time To One of the destination nodes 530, 531 (eg, the destination node 530) will extract the first data symbol transmitted by the relay node 520 At the same time, the data transmitted by the source node 510 is regarded as interference. And at the time with Another destination node (eg, destination node 531) will extract the second data symbol transmitted by source node 510 At the same time, the signal transmitted by the relay node 520 is regarded as interference.

The mixed signal received by the destination node 530 or 531 from the source node 510 and the relay node 520 can be expressed as ,among them Is the signal received at the destination node n and in the kth symbol interval, and is with Mixed signal. Destination node 530 at time with The mixed signal is received from the source node 510 and the relay node 520. Destination node 530 will receive the received signal Demodulation is performed to extract symbols transmitted by the relay node 520 At the same time, the signal transmitted by the source node 510 is regarded as interference. Destination node 531 at time with The mixed signal is received from the source node 510 and the relay node 520. Destination node 531 receives the received signal Demodulation is performed to extract the symbols transmitted by the source node 510 At the same time, the signal transmitted by the relay node 520 is regarded as interference.

Finally, destination node 530 will receive the signal And the destination node 531 will receive the signal . The destination node 530, 531 can extract the signal transmitted from the source node 510 using conventional decoding methods. It should be noted that the destination node 330 of the diversity mode must extract the signal transmitted from the source node 310 using the ML decoding method because the signal received in the destination node 330 includes a combination of two different symbols of the current symbol and the past symbol. Therefore, the destination node 330 of the diversity mode must demodulate the signal using a more complicated method. However, in the multiplex mode, since the signal received in the destination node 530 or the destination node 531 receives only one symbol at a time, the destination node 530 or 531 can demodulate the signal using a conventional method.

Therefore, destination node 530 will demodulate with interference And noise Receiving signal into ,among them Is the channel between the relay node 520 and the destination node 530 (assuming the channel is single-order), Is the interference caused by the source node signal, and It is the noise received at the destination node 530. Destination node 531 will demodulate with interference And noise Receiving signal into ,among them Is the channel between the source node 510 and the destination node 531 (assuming the channel is single-order), Is the interference caused by the relay node 520, and It is the noise received at the destination node 531.

In short, in the method of relaying signals in the multiplex mode, the repeater only receives the current symbol from the source node. The repeater can demodulate the received signal and modulate the demodulated symbol again using a lower order modulation type than the source node, and transmit the remodulated symbol to the two destinations. Therefore, the re-modulation and delay process also enables the repeater to remove the noise signal when receiving the signal from the source node and prevent the repeater from forwarding the improper noise signal to the destination. Thus, although each destination is still subject to some interference, system throughput is improved by transmitting two streams simultaneously (because the transfer involves two destinations).

In summary, the method for relaying signals proposed by the embodiment has two different transmission topologies, including a diversity mode and a multiplexing mode. In the diversity mode, the repeater receives the combined signal, and the combined signal includes a current symbol and a past symbol respectively having a power configuration. The repeater may demodulate the combined signal received from the source node, modulate the demodulated symbol again using the same modulation type as the source node, and transmit the remodulated symbol to the destination. In multiplex mode, the repeater only receives the current symbol from the source node. However, the repeater can demodulate the received signal, modulate the demodulated symbol again using a lower order modulation type than the source node, and transmit the remodulated symbol to multiple destinations. Therefore, through the signal relay mechanism, the method proposed by the disclosure can not only improve the network throughput of the source node to the destination, but also improve system performance and further provide better service for the user.

The present disclosure has been disclosed in the above embodiments, but it is not intended to limit the disclosure, and any person skilled in the art can make some changes and refinements without departing from the spirit and scope of the disclosure. The scope of protection of this disclosure is subject to the definition of the scope of the appended claims.

100, 300, 500‧‧‧ relay system
110, 310, 510‧‧‧ source nodes
120, 320, 520‧‧‧ relay nodes
130, 330, 530, 531‧‧‧ destination node
210‧‧‧ transceiver circuit
220‧‧‧Storage circuit
230‧‧‧Processing Circuit
340, 341, 342, 540, 541, 542, 543, 544‧‧‧ channels
S410, S420, S430, S440, S610, S620, S630, S640‧‧ steps

1 is a schematic diagram of a relay system according to an embodiment of the present disclosure. 2 is a block diagram of a relay node in accordance with an embodiment of the present disclosure. FIG. 3 is a basic block diagram of a relay system in a diversity mode according to an embodiment of the present disclosure. 4 is a flow chart of a method for relaying a relay signal of a relay node according to an embodiment of the disclosure. FIG. 5 is a basic block diagram of a relay system in a multiplex mode according to an embodiment of the present disclosure. FIG. 6 is a flowchart of a method for relaying a relay signal of a relay node according to an embodiment of the disclosure.

S410, S420, S430, S440‧‧ steps

Claims (13)

A method for relaying a signal, which is applicable to a repeater, comprising: receiving a signal having a power configuration from a source node; demodulating the signal having a power configuration to extract a symbol; and transforming the symbol into a symbol again a re-modulated symbol; and transmitting the re-modulated symbol to a destination according to a particular delay, wherein the signal having the power configuration includes a current symbol and a past symbol respectively having a power configuration, wherein The specific delay is a specified time until the beginning of a certain symbol interval. The method of claim 1, wherein the signal having the power configuration transmitted by the source node is expressed as: Where k is a positive integer, s _k represents the signal in the kth symbol interval, x _k represents the kth symbol, α represents the power configuration factor, δ represents the delay factor, and L represents the total number of symbols. The method of claim 1, wherein the symbol is again modulated using the same modulation type as the source node. The method of claim 1, wherein the method further comprises: The remodulated symbol is rotated by multiplying by a rotation factor. The method of claim 1, wherein the destination uses the most approximate decoding to demodulate the received signal. A method for relaying a signal, which is applicable to a repeater, comprising: receiving a signal having a power configuration from a source node; demodulating the signal having a power configuration to extract a symbol; and transforming the symbol into a symbol again a symbol that is modulated again, wherein the relay station modulates the symbol again using a modulation type lower than the source node; transmitting the remodulated symbol to a destination according to a specific delay And transmitting the re-modulated symbol to another destination according to the specific delay, wherein the destination extracts the first data symbol transmitted by the relay station in a first time interval, and the The data transmitted by the source node is regarded as interference, and the another destination extracts the second data symbol transmitted by the source node in a second time interval, and simultaneously considers the signal transmitted by the relay station as interference, wherein the The first time interval overlaps with the second time interval, wherein the particular delay is a specified time until a certain symbol interval begins. The method of claim 6, wherein the power configuration comprises a power configuration factor having a value of one. A repeater comprising: a transceiver circuit configured to transmit and receive wireless signals; a storage circuit to store a plurality of code; a processing circuit operatively coupled to the transceiver circuit and the storage circuit and configured to access the code to perform an operation of receiving a signal having a power configuration through the transceiver circuit; a signal having a power configuration is demodulated to extract a symbol; the symbol is again modulated into a re-modulated symbol; and the re-modulated symbol is transmitted through the transceiver circuit in accordance with a particular delay, wherein The signal having the power configuration includes a current symbol and a past symbol respectively having a power configuration, wherein the specific delay is a specified time until a certain symbol interval begins. The repeater according to claim 8, wherein the signal having the power configuration is transmitted from a source node, and the signal having the power configuration is expressed as: Where k is a positive integer, s _k represents the signal in the kth symbol interval, x _k represents the kth symbol, α represents the power configuration factor, δ represents the delay factor, and L represents the total number of symbols. The repeater of claim 8, wherein the signal having a power configuration is transmitted from a source node, the processing circuit further accessing the code to use the same modulation as the source node The type modulates the symbol again. The repeater of claim 8, wherein the processing circuit further accesses the code to perform rotating the re-modulated symbol by multiplying a twiddle factor. A repeater comprising: a transceiver circuit configured to transmit and receive wireless signals; a storage circuit to store a plurality of code codes; and a processing circuit operatively coupled to the transceiver circuit and the storage circuit And configured to access the code to: receive a signal having a power configuration through the transceiver circuit; demodulate the signal having a power configuration to extract a symbol; re-adjust the symbol Transmitting the re-modulated symbol; and transmitting the re-modulated symbol through the transceiver circuit in accordance with a particular delay, wherein the processing circuit accesses the code to perform the trans-transceiving The circuit transmits the re-modulated symbol to a destination and another destination in accordance with the particular delay, wherein the signal having the power configuration is transmitted from a source node, the processing circuit further accessing the code to Re-modulating the symbol using a lower order modulation type than the source node, wherein the destination extracts the first time interval Following the first station transmitted data symbol, while the data transmitted by the source node as interference, and a second alternate destination resource extracting a second time interval of the transmission source node And symbolizing the signal transmitted by the relay station as interference, wherein the first time interval overlaps with the second time interval, wherein the specific delay is a specified time until a certain symbol interval starts. The repeater of claim 12, wherein the power configuration comprises a power configuration factor having a value of one.